Pliny j



(No Mudel.)

P. J. WRIGHT & S. RUST.

DEVIGE'POB. DRESSING VALVE SEATS OP GLOBE VALVES.

No. 278.478. Patented May 29,1883.

UNITED STATES I I PATENT OFFICE.

PLINY J. WEIGHT AND SAMUEL RUST, OF SOUTH HADLEY FALLS, MASS.

DEVICE FOR DRESSING VALVE-SEATS OF GLOBE-VALVES.

SPECIFICATION forming part'of Letters Patent No. 278,478, dated May 29, 1883. 1 Application flled February 24, I883. (No model.)

To all whom it may concern Be it known thatwe, PLlNY J. WRIGHT and SAMUEL RUST, citizens of the United States, residing at South Hadley Falls, in the county of Hampden and State of Massachusetts, have invented new and useful Improxements in Dressing-Tools for Valve-Seats of Globe-Valves, of which thefollowin g is a specification.

Our'invention relates to a new tool having for its object the dressing or restoration of the valve-seats of globe-valves without removing them from their positions; and its nature is fully illustrated in the accompanying drawrings, in which-- Figure I is an elevation of our tool in position in a globe-valve, shown in transverse section. Fig. IIis an elevation of a part of the todl. Fig. III is an end view of the tool, and Fi IV and Vare views of parts of the same.

Wheh from thecorrosive action of steam the valve-seat of a brass globe-valve has become par'tiallyeaten away, and so practically destroyed; it has been necessary heretofore to remove the entire globe-valve either to replace it with a perfect one'or repair it; but by this device the seat may be quickly dressed 'upon only removing the valve to expose its seat.

B is a stem adapted at its upper end to be received in a bit-stock or other convenient handle for rotating it, and formed at its lower end into a flat shoulder, 12, surrounding a screwstem, d, prolonged axially from the stem 13. Received over the stem d through the corresponding hole, a, therein is the cutter (J. The cutter O, of a flat disk shape, has one or both sides file-cut, and when received over stem d is squarely seated upon the shoulder 12, with the plane of its sides at right angles to the axis of stem B. Received over stem cl through its central hole, 9, and to have one side come flatly against the cutter G, is the circular guide D; and against the under side of guide 1), upon screw-stem d, comes the out '5, which, when tightened, securely binds the guide D and cutter 0 against shoulder b, to cause all ofthe parts to be rigid with the stem. The'thickness of guide D equals that of the walls of the valve-seat, and its perimeter filling the port holds the projecting cutting-surface of the cutter O in. the position to form a perfect valveseat and at the proper angle to the axis of the port.

It will be seen that upon the same stem B cutters and guides may be combined to meet the requirements of difierent-sized globe-valves.

The cutters we prefer to form, as seen in Figs. III and IV, to have on opposite sides cutting-surfaces of varying coarseness, so that the finer, when brought into position, may act as a finishing-tool to the formed seat, and so that the rough opposite sidesefi'ectually prevent the cutter and guide from rotating upon the shoulder d.

By this tool'ma'ny valves which would be discarded orused in a leaky condition may quickly be made as good as new.

Now, having described our invention, what we claim isl. The within-described.tool for dressingthe seats of globe-valves, consisting of a stem, B, adapted to have one end received in a bitstock or other rotating handle, and having its other provided with a shoulder, b, and screwstem d, a perforated disk cutter, (J, a perforated guide, D, and a nut, '5, all combined and arranged to operate in the manner and for the purpose set forth.

2. The combination, with the stem B, screw (1, guide I), and lint dot the perforated disk cutter 0, provided with a file-surface upon PLINY J. \VEIGHI. SAMUEL RUST.

Witnesses:

E. G. SOUTHWORTH, WM. H. GHAPIN. 

